Reference solutions

Reference solutions are not included with most meters, although they are necessary to calibrate your meter. For pH, the 7.0 solution is the solution to use for primary calibration. If accurate readings below pH 6.0 are consistently needed, the 4.0 solution is also recommended. For best calibration and accuracy, use both the 7.0 and 4.0 reference solutions.

Get pH information without a meter when you use our soil pH test kits shown here.